单项选择题

I have to give up my job in advertising because I can't keep up with the rapid ______ of work.

A. rate
B. pace
C. speed
D. velocity
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单项选择题
Thousands of people are packed tightly in trains, the men's faces ______ in their evening papers, while the women trying in vain to knit.
A. burying
B. buried
C. to bury
D. being buried
单项选择题
______ I admire his wise, I do not think he acted wisely.
A. When
B. Whether
C. While
D. Otherwise
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